[PATCH] drm/sched: Remove optimization that causes hang when killing dependent jobs

[Philipp Stanner]

+Cc Greg, Sasha

On Wed, 2025-07-16 at 12:40 +0200, Michel Dänzer wrote:
> On 16.07.25 11:57, Philipp Stanner wrote:
> > On Wed, 2025-07-16 at 09:43 +0000, cao, lin wrote:
> > > 
> > > Hi Philipp,
> > > 
> > > 
> > > Thank you for the review. I found that this optimization was
> > > introduced 9 years ago in commit
> > > 777dbd458c89d4ca74a659f85ffb5bc817f29a35 ("drm/amdgpu: drop a
> > > dummy
> > > wakeup scheduler").
> > > 
> > > 
> > > Given that the codebase has undergone significant changes over
> > > these
> > > 9 years. May I ask if I still need to include the Fixes: tag?
> > 
> > Yes. It's a helpful marker to see where the problem comes from, and
> > it
> > adds redundancy helping the stable-kernel maintainers in figuring
> > out
> > to which kernels to backport it to.
> > 
> > If stable can't apply a patch to a very old stable kernel because
> > the
> > code base changed too much, they'll ping us and we might provide a
> > dedicated fix.
> > 
> > So like that:
> > 
> > Cc: stable at vger.kernel.org # v4.6+
> > Fixes: 777dbd458c89 ("drm/amdgpu: drop a dummy wakeup scheduler")
> 
> FWIW, Fixes: alone is enough for getting backported to stable
> branches, Cc: stable is redundant with it.

Both are used all the time together, though. And the official
documentation does not list dropping Cc: stable as a valid option in
this regard

https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html#option-1


As long as the official documentation demands it, I'm not willing to
drop it. If the docu were to be changed, that would be fine by me, too.


P.


> 
>